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First of all your boyfriend shouldn't be close with any girl who isn't blood related to him , no female " bestfriends " pretend " sisters " none of that . But to tell if they are cheating pay attention to how they act around eachother . If they spend more time together than you & him do than chances are they are messing around . If she spends the night at his house when no one's home ? Chances are they're doing something. If she calls him bae baby or babe , chances are they're doing something. If i were you i would shut that " brother , sister " thing down real quick.

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12y ago
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16y ago

You have to have trust in the relationship. If you do not, then break up. Try talking dirt with the sister.

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15y ago

ask him and you just have to trust his answer or do what you feel is right

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Q: My boyfriend cheated on me with my sister and I would like to know how do I know if he's still cheating on me?
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